The cursor index provided by this package is a 1D character index (not byte index), while
the cursor position in the Atom core is a 2D point formed by a pair of row and column number.
apm install cursor-index
The cursor index of the text cursor for the active pane
will be shown on the left of the status bar after installation.
Clicking on it pops up a dialog to enter the cursor index to be navigated,
just like clicking on the cursor position.
Pressing ALT-G is the corresponding short-cut. (Can be disabled in Settings)
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.